Add time:07/19/2019         Source:sciencedirect.com

Spherosil (with the commercial name “Porasil”) is one of the most specific adsorbents and its application is widened by its use in gas chromatography. It is based on porous silica beads, and is able, because of the hydroxyl groups on its surface, its sorption character, the behaviour of benzene, n-hexane and cyclohexane was followed, i.e., thta of sorbates with the same number of carbon atoms but with different structures. Attention was paid to the activation conditions and to the dependence of the sorption character on changes in specific surface area. It was important to decide to what degree the concentration of the surface hydroxyl groups varies with changes in the specific surface area. The measurement and evaluation of adsorption isotherms were carried out by the frontal chromatographic technique, using Spherosils with four different surface areas. It is concluded from the calculated absolute adsorption isotherm that, in the series of Spherosils studied, a change in the geometrical surface area and possibly in the porosity play a predominant role while the concentration of hydroxyl groups on the surface is approximately constant.

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